/Engine/Source/Runtime/Engine/Classes/Engine/SkinnedAsset.h
Wait for the asset to finish compilation to protect internal skinned asset data from race conditions during async build. A derived class may want to define its async properties as enums and cast them to uint64 when calling this function.
void WaitUntilAsyncPropertyReleasedInternal ( uint64 AsyncProperties, ESkinnedAssetAsyncPropertyLockType LockType ) const